This example renders a smiling face as a composite of SVG shapes. A yellow circle forms the face, two black circles serve as eyes, and an arc path creates the mouth. The visualization demonstrates how React components build the SVG structure, while D3 handles the mouth's geometry through its `arc` generator. Both React and D3 are loaded directly in an HTML page via CDN. The `Smiley` component combines the individual face, eyes, and mouth components into a single centered SVG container, showing a simple integration of React and D3 for static vector graphics.